A. rongga mulut – kerongkongan – lambung – usus halus – usus besar – anus
B. rongga mulut – tenggorokan – lambung – usus halus – usus besar – anus
C. rongga mulut – kerongkongan – lambung – usus besar – usus halus – anus
D. rongga mulut – tenggorokan – lambung – usus besar – usus halus – anus
Jawaban: A
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